Abstract
The transverse Beam Breakup Instability (BBI) can result in reduced pulse length in linear accelerators. A brief summary of the instability mechanism and a gain formula are presented. Test bench measurements of the two relevant parameters, transverse shunt impedance Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> , and cavity Q have been made. These measurements illustrate the importance of transmission line dielectric and cavity geometry to the gain. Results indicate that Q may vary from 10 - 75, and that Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> /Q is in the range 4 - 70 Ω.
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